Biodegradable body temperature‐responsive shape memory polyurethanes with self‐healing behavior

Li, Shuai; Zhang, Jun; Chen, Jianjun; Yao, Ming; Liu, Xuepeng; Jiang, Zhiguo

doi:10.1002/pen.25061

Cited by 23 publications

(11 citation statements)

References 21 publications

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“…20 °C) and the body temperature and (ii) the materials sustain their mechanical strength under the operating conditions. Both criteria depend strongly on the nature of the non-covalent bonds used and the physical interactions between the molecular components, thereby making it challenging to achieve body temperature activated shape memory effect 56 , 57 . Nevertheless, strategies including the preparation of dual-crosslinking supramolecular SMPs 58 , 59 and co-polymerization of co-monomers with SMP substrates 54 to adjust molecular cohesive forces as well as thermal properties close to body temperature have been reported.…”

Section: Introductionmentioning

confidence: 99%

Halogen-bonded shape memory polymers

et al. 2022

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Halogen bonding (XB), a non-covalent interaction between an electron-deficient halogen atom and a Lewis base, is widely adopted in organic synthesis and supramolecular crystal engineering. However, the roadmap towards materials applications is hindered by the challenges in harnessing this relatively weak intermolecular interaction to devise human-commanded stimuli-responsive soft materials. Here, we report a liquid crystalline network comprising permanent covalent crosslinks and dynamic halogen bond crosslinks, which possess reversible thermo-responsive shape memory behaviour. Our findings suggest that I···N halogen bond, a paradigmatic motif in crystal engineering studies, enables temporary shape fixation at room temperature and subsequent shape recovery in response to human body temperature. We demonstrate versatile shape programming of the halogen-bonded polymer networks through human-hand operation and propose a micro-robotic injection model for complex 1D to 3D shape morphing in aqueous media at 37 °C. Through systematic structure-property-performance studies, we show the necessity of the I···N crosslinks in driving the shape memory effect. The halogen-bonded shape memory polymers expand the toolbox for the preparation of smart supramolecular constructs with tailored mechanical properties and thermoresponsive behaviour, for the needs of, e.g., future medical devices.

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Section: Introductionmentioning

confidence: 99%

Halogen-bonded shape memory polymers

et al. 2022

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“…They managed to determine electrical conductivity and mechanical property, morphology, and chemical structure of this nanocomposite. Zhiguo et al [27] tried to synthesize biodegradable body temperature-responsive shape memory polyurethanes, with self-healing function, from different chain extenders and polycarbonate diol, which exhibited a good memory behavior for medical applications.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on self-activated healing performance of thermosetting polyurethane prepared by tungsten (VI) chloride catalyst

Fereidoon

Ghasemi-Ghalebahman

Amini‐Nejad

et al. 2020

Mater. Res. Express

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Polymers and polymeric composites are widely used for various applications due to their outstanding and wide range of properties. Polyurethanes, existing in different types, are novel and versatile polymers with excellent mechanical properties. Thermosetting polyurethane resins are among the most widely used polyurethanes wherein their manufacturing and developing have been introduced during the last few years. Self-healing materials have been inspired by biological systems in which damages provoke healing responses. It is almost cost-effective to use self-healing materials in commercial applications. This study investigates a novel self-activated approach in thermosetting polyurethane resins. A tungsten (VI) chloride (WCl 6 ) catalyst, a co-activator (phenylacetylene) and a dissolution agent (nonylphenol) were used for the onset of ring-opening metathesis polymerization of dicyclopentadiene. Here different percentages of a catalyst in polyurethane resins were used, the impacts of which on fracture toughness and healing efficiency were also studied. To examine healing efficiency, samples with tapered double-cantilever beam geometry were prepared and using the selfactivated method, the development of thermosetting polyurethane self-healing was investigated. The results showed that the concentration of catalyst affects the basic properties of the material and healing efficiency of the composite. The highest healing efficiency of 97% was obtained for a 3 wt% catalyst.

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“…Conventional BAs have been replaced with natural BAs which is more environmentally friendly. Further, conversion of PU into absorbent material may give advantages to be applied in industrial and commercial applications such as soilless cultivation, diapers, [ 24 ] cosmetics, medical products, [ 25 ] composites, and marine pollutants absorbents.…”

Section: Introductionmentioning

confidence: 99%

The effect of water and sodium hydrogen carbonate content on flexible polyurethane's microstructure, water, and mechanical properties

Fawzi

Al-Talib

2022

Polymer Engineering & Sci

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It is well known that blowing agents (BAs) and polyol are essential components in polyurethane (PU) composition. Utilizing renewable sources in the material's formulation might reduce its environmental hazards while extending its possible engineering applications. In this study, the samples have been synthesized by using palm kernel oil-based polyol (PKOP). Water and sodium hydrogen carbonate (SHB) have been used as BAs. Scanning electron microscopy (SEM) has shown that adding the mix of BAs is causing the cells' average size to increase up to 227% and have reduced the lamellae width by up to 2% in comparison with the reference sample. The water tests have illustrated that combining two parts per hundred polyol by weight (php) water and 25 php SHB to the sample has increased its water capacity up to 617%. However, the samples are only able to retain 6% of the absorbed water at the 7th day. It has been also found that porosity has affected the water uptake and all the samples are following Fick's diffusion law, and diffusion is correlated to the square root of time. Multivariable power least squares method (MPLSM) and moving least squares method (MLSM) have been applied to find the relation between tear resistance value and BAs ratio. It is found that both methods have a dominant variable compared to the other variables, but MLSM provided optimizable equation with better R 2 .

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Biodegradable body temperature‐responsive shape memory polyurethanes with self‐healing behavior

Cited by 23 publications

References 21 publications

Halogen-bonded shape memory polymers

Halogen-bonded shape memory polymers

Experimental investigation on self-activated healing performance of thermosetting polyurethane prepared by tungsten (VI) chloride catalyst

The effect of water and sodium hydrogen carbonate content on flexible polyurethane's microstructure, water, and mechanical properties

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